Wei Guan

Wei Guan (220-291) was co-regent of Jin China alongside Sima Liang. In 291, they were overthrown by Sima Wei in a military coup and executed on the orders of Empress Jia Nanfeng.

Biography
Wei Guan was born in Anyi, Hedong Commandery, Cao Wei in 220, and he became an official under Emperor Cao Huan. He served as Deng Ai's deputy during the Conquest of Shu in 263, and, during Zhong Hui's uprising against Wei in 264, Wei Guan was sent by Zhong Hui to arrest Deng Ai as part of the coup. Wei Guan succeeded, but he later betrayed and killed Zhong Hui after starting a mutiny, and he then had Deng Ai assassinated to prevent him from retaliating against him. He continued to be an important official and general under Jin, and he advised Emperor Sima Yan to change his heir apparent from his developmentally-disabled son Sima Zhong. In 291, after the regent Yang Jun was overthrown in a coup by Empress Jia Nanfeng and Prince Sima Wei, Wei Guan and Sima Liang were chosen as the new regents. However, the two regents sought to remove Sima Wei from his command due to his hot-headedness, and Sima Wei sent his officers Qi Sheng and Gongsun Hong to convince Jia Nanfeng that Wei Guan and Sima Liang planned to depose the Emperor. Jia Nanfeng agreed to plot a second coup, and Sima Liang, his eldest son Sima Ju, and Wei Guan were arrested and executed for treason.